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首页> 外文会议>International Conference on Advanced Structural Steels >Numerical Simulation of Direct Current Flash Butt Welding Process and HAZ Structures for a 400MPa Ultra Fine Grain Reinforcing Steel Bar
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Numerical Simulation of Direct Current Flash Butt Welding Process and HAZ Structures for a 400MPa Ultra Fine Grain Reinforcing Steel Bar

机译：400MPA超细晶粒增强钢杆直流闪电对焊接工艺和HAZ结构的数值模拟

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摘要

FEM of axial symmetry was used to simulate the process of DC Flash butt welding. Element live-death method was adopted to simulate metal melt. The temperature field of the weld joint via this method was computed. Thermal rigid-viscoplastic finite element method and Monte Carlo simulation technology were adopted in this work. After considering the coupling effect of electricity, heat and forging and the loss of mass in the flashing process, welding deformation, weld formation and austenite grain growth in the HAZ were simulated. The simulations give out the evolution of grain structure, grain size distribution in HAZ of the ultra-fine grain steel bar and block effect of grain growth by temperature gradient. The research provides the effective analyzing way of establishing welding parameters and improving the welding properties of ultra fine grain steel and the quality in the welded joints.
机译：轴对称的有限元件用于模拟直流闪光对接焊接的过程。采用元素实时死亡方法来模拟金属熔体。计算通过该方法的焊接接头的温度场。在这项工作中采用了热刚性粘塑性有限元方法和蒙特卡罗仿真技术。在考虑到电力，热和锻造的耦合效果以及闪光过程中的质量损失，模拟了HAZ中的焊接变形，焊接和奥氏体晶粒生长。仿真透露谷物结构的演变，超细晶粒钢条的HAZ中的晶粒尺寸分布，并通过温度梯度阻止晶粒生长的影响。该研究提供了建立焊接参数的有效分析方法，提高超细晶粒钢的焊接性能及焊接接头中的质量。

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